Dammit, I still live in the real world and I'd bet money that few of us can shoot a 5 inch group with a double at 100 yards...

My personal gun won the double gun Nationals last year and it will shoot near 2.5 to 3 inches at 100 with my old eyes, but my 30-30 trapper will shot an inch to an inch and a half at the same range with the same eyes. Certainly recoil is a factor in such efforts...

But IMO the double came about for shooting Buff and elephant at close range, so I am not very concerned about its performance at 100 and over...However I did shoot a buff in the sticking spot center at 108 yards with my 470 and a Woodleigh soft about two weeks ago, had to be some luck in such a shot...

For the most part about any "good" double, and they are not all good, should be able to plunk one in the chest cavity of a buff at 100 to perhaps even 200 yards if you know your gun and can shoot and have practiced at that range, after all you have about 3 feet of killing zone there...you also have about 3 ft. of wounding zone on each side of that, so take care....